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Abstract
Variable-fidelity optimization (VFO) can be efficient in terms of the computational cost when compared with traditional approaches, such as gradient-based methods with adjoint sensitivity information. In variable-fidelity methods, the directoptimization of the expensive high-fidelity model is replaced by iterative re-optimization of a physics-based surrogate model, which is constructed from a corrected low-fidelity model. The success of VFO is dependent on the reliability and accuracy of the low-fidelity model. In this paper, we present a way to develop a fast and reliable low-fidelity model suitable for aerodynamic shape of transonic wings. The low-fidelity model is component based and accounts for the zero-lift drag, induced drag, and wavedrag. The induced drag can be calculated by a proper method, such lifting line theory or a panel method. The zero-lift drag and the wave drag can be calculated by two-dimensional flowmodel and strip theory. Sweep effects are accounted for by simple sweep theory. The approach is illustrated by a numerical example where the induced drag is calculated by a vortex lattice method, and the zero-lift drag and wave drag are calculated by MSES (a viscous-inviscid method). The low-fidelity model is roughly 320 times faster than a high-fidelity computational fluid dynamics models which solvesthe Reynolds-averaged Navier-Stokes equations and the Spalart-Allmaras turbulence model. The responses of the high- and low-fidelity models compare favorably and, most importantly, show the same trends with respect to changes in the operational conditions (Mach number, angle of attack) and the geometry (the airfoil shapes).
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Authors (3)
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Leifur Leifsson
- Reykjavik University Engineering Optimization & Modeling Center, School of Science and Engineering
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Sławomir Kozieł prof. dr inż.
- School of Science and Engineering, Reykjavik University Engineering Optimization & Modeling Center
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.procs.2014.05.073
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Details
- Category:
- Conference activity
- Type:
- materiały konferencyjne indeksowane w Web of Science
- Published in:
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Procedia Computer Science
no. 29,
pages 811 - 820,
ISSN: 1877-0509 - ISSN:
- 1877-0509
- Language:
- English
- Publication year:
- 2014
- Bibliographic description:
- Leifsson L., Kozieł S., Bekasiewicz A..: Fast Low-fidelity Wing Aerodynamics Model for Surrogate-Based Shape Optimization, W: , 2014, Elsevier,.
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.procs.2014.05.073
- Verified by:
- Gdańsk University of Technology
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